The harm of static electricity and the importance of prevention and control in the chemical industry
Abstract: The hazards caused by static electricity have received considerable attention in the production departments of the chemical industry. However, the research on the hazards and prevention of static electricity in the warehousing departments of these industries is still a weak link. With the continuous expansion of the functions and scale of warehousing, how to control and prevent the harm caused by static electricity has gradually attracted people’s attention. 1. Static electricity is generated in the warehousing process. The generation of static electricity has its internal and external causes. The internal cause depends on the conductive properties of the material, and the common external cause is the material’s conductive properties.
The harm caused by static electricity has been severely affected in the chemical industry production department Considerable attention has been paid to it, but the research on the harm and prevention of static electricity in the warehousing departments of these industries is still a weak link. With the continuous expansion of the functions and scale of warehousing, how to control and prevent the harm caused by static electricity has gradually attracted people’s attention.
1. Static electricity generation in the warehousing process
The generation of static electricity has its internal and external causes. The internal cause depends on the conductive properties of the material, and the external cause is the common friction between materials that causes electrification. Such as friction, rolling, impact, etc. between materials during storage and transportation. Followed by attached charging, induction charging, etc. As far as the warehousing department is concerned, many commodities and packages have internal conditions for the generation of static electricity. At the same time, warehousing operations are inseparable from operations such as handling, stacking, tarpaulin, and covering. Therefore, it is inevitable to generate static electricity between commodities. Friction, rolling, impact, etc. For example, when petroleum or organic solvents are transported in warehouses and discharged into tanks, friction will occur between these materials and pipeline walls and equipment, which will produce high static electricity accumulation. Plastic packaging of general commodities will also generate static electricity due to mutual friction during the stacking process.
2. Hazards of static electricity in warehousing The harm caused by static electricity in warehousing activities is mainly due to its ability to accumulate on the surface of objects to form a high static potential and prone to electrostatic discharge sparks. The harm mainly lies in two aspects:
1. It is easy to cause explosion accidents. For example, flammable liquids(such as gasoline, kerosene, diesel) and organic solvents stored in warehouses >(Benzenes, ethers, ketones), the vapors they emit are mixed with air to a certain proportion, or solid When the dust reaches a certain concentration, which is the explosion limit, it will become an ignition source and cause an explosion once it encounters an electrostatic discharge spark.
2. It is prone to electric shock. For example, high-potential electrostatic discharges during transportation may cause discomfort to operators, which often occurs among workers who carry plastic packaging items in warehouses. High-potential electrostatic discharges may occur due to strong friction during transportation and stacking. , there have even been cases where operators were knocked down by electrostatic discharge.
3. Prevention and Control of Static Electricity Hazards in Warehouses
The following steps are generally used to prevent and control hazards caused by static electricity in warehousing.
1. Materials should be controlled to avoid generating static electricity as much as possible. For example, for flammable liquids, limit their flow rate in pipelines and control The loading and unloading method prevents the mixing of different oils and solvents and the inclusion of water and air in the liquid.
2. Take measures to dissipate the generated static electricity as soon as possible to avoid accumulation. For example, installing good grounding devices on equipment, increasing the relative humidity of the workplace, laying conductive floors on the ground, and spraying conductive paint on certain tools are all conducive to the discharge of static electricity.
3. Add a certain amount of countercharge to the charged body to neutralize the charge on the charged body and avoid an increase in static voltage. Such as the use of induction static neutralizer belongs to this type of method.
4. In some cases, the accumulation of static electricity is unavoidable, and the static voltage rises rapidly and even generates electrostatic discharge sparks, so measures must be taken Measures are taken to prevent fire and explosion accidents despite discharge. For example, the space of the flammable liquid storage tank is filled with inert gas such as nitrogen, a control alarm device is installed, and a high-efficiency exhaust device is used to prevent the flammable gas or dust in the air from reaching the explosion limit.
5. In places with fire and explosion hazards, such as chemical hazardous material storage places, staff should wear conductive shoes and conductive shoes. Static work clothes, etc., timely elimination of static electricity carried by the human body is also one of the effective measures to prevent static electricity hazards.
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The harm of static electricity and the importance of prevention and control in the chemical industry
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